Load Specifications
Load data in caliber 7 x 57 R with .284 | 145gr | Speer Hot-Cor bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, ReloadSwiss RS 70 and Alliant Reloder-17.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 43,120 psi | 87% | 2552 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,424 psi | 88% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,163 psi | 86% | 2641 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 42,395 psi | 86% | 2562 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,641 psi | 86% | 2690 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,163 psi | 86% | 2589 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,279 psi | 86% | 2595 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,454 psi | 90% | 2707 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,556 psi | 90% | 2733 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,043 psi | 77% | 2598 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,337 psi | 86% | 2749 fps | 97.2% |
| Bofors RP3 | <<locked>> | 86% | 44,599 psi | 90% | 2644 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 42,830 psi | 87% | 2598 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,569 psi | 88% | 2641 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,221 psi | 88% | 2644 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,331 psi | 72% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,527 psi | 90% | 2595 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 43,221 psi | 88% | 2644 fps | 97.9% |
| IMR 4895 | <<locked>> | 82% | 43,308 psi | 88% | 2625 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 44,440 psi | 90% | 2598 fps | 99.7% |
| Lovex S065 | <<locked>> | 90% | 43,830 psi | 89% | 2592 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 41,655 psi | 84% | 2582 fps | 98.5% |
| Norma URP | <<locked>> | 92% | 42,177 psi | 86% | 2638 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 84% | 44,179 psi | 90% | 2654 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 44,106 psi | 89% | 2680 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 73% | 1736 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,280 psi | 90% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,785 psi | 85% | 2657 fps | 97.2% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,916 psi | 85% | 2671 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 82% | 43,830 psi | 89% | 2569 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 86% | 41,959 psi | 85% | 2589 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,830 psi | 89% | 2592 fps | 96.5% |
| Shooters World Precision | <<locked>> | 84% | 44,440 psi | 90% | 2598 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,207 psi | 88% | 2641 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,585 psi | 90% | 2526 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,627 psi | 86% | 2589 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 43,033 psi | 87% | 2697 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 43,178 psi | 88% | 2549 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,830 psi | 89% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,511 psi | 88% | 2579 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 44,135 psi | 90% | 2638 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 82% | 42,105 psi | 85% | 2546 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,366 psi | 88% | 2641 fps | 97.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,336 psi | 84% | 2674 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,164 psi | 90% | 2618 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,127 psi | 69% | 2589 fps | 97.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 40,379 psi | 82% | 2503 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,159 psi | 77% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,345 psi | 70% | 2477 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 37,333 psi | 76% | 2457 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,030 psi | 81% | 2635 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,086 psi | 75% | 2484 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,682 psi | 80% | 2543 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,621 psi | 70% | 2487 fps | 95.2% |
| Alliant Reloder-17 | 42.4 gr | 80% | 31,908 psi | 65% | 2444 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,792 psi | 64% | 2441 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,999 psi | 75% | 2625 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 36,695 psi | 74% | 2487 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 80% | 37,463 psi | 76% | 2487 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,936 psi | 61% | 2336 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,263 psi | 82% | 2589 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 53% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,189 psi | 79% | 2490 fps | 97.5% |
| IMR 4831 | <<locked>> | 88% | 35,578 psi | 72% | 2487 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 40,654 psi | 82% | 2572 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 39,146 psi | 79% | 2497 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 38,754 psi | 79% | 2490 fps | 95% |
| Norma 203B | <<locked>> | 80% | 39,059 psi | 79% | 2530 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 34,737 psi | 70% | 2477 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 38,667 psi | 78% | 2546 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 41,162 psi | 83% | 2621 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,731 psi | 54% | 1549 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,939 psi | 69% | 2510 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,492 psi | 74% | 2546 fps | 95.5% |
| ReloadSwiss RS 70 | 48.4 gr | 90% | 39,146 psi | 79% | 2608 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 41,104 psi | 83% | 2516 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,461 psi | 70% | 2431 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,754 psi | 79% | 2490 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 39,146 psi | 79% | 2497 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,273 psi | 72% | 2474 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,912 psi | 75% | 2388 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,201 psi | 71% | 2434 fps | 97.3% |
| Somchem S365 | 41.2 gr | 82% | 27,267 psi | 55% | 2316 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 40,408 psi | 82% | 2500 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,133 psi | 83% | 2510 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,591 psi | 68% | 2379 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 36,361 psi | 74% | 2480 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 39,552 psi | 80% | 2497 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,650 psi | 72% | 2480 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 34,142 psi | 69% | 2516 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,791 psi | 60% | 2300 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,008 psi | 61% | 2457 fps | 95.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 46 powders for 7 x 57 R loaded with the .284 | 145gr | Speer Hot-Cor. Alliant Reloder-26 delivers the highest muzzle velocity at 2,749 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,749 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, Hodgdon TrailBoss reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Somchem S365, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .284 | 145gr | Speer Hot-Cor they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.